SharePoint SSP site authentication problem.

A SharePoint Server 2007 Shared Service Provider administration site using a host header never authenticates users when opened from the server’s console.  To solve this, create the DWORD DisableLoopbackCheck under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa and set it to the value 1.  After that, reboot the comuter.

Note: the problem only occurs when opening the website on the console of the server, not from a client.  Disabling the loopback check should be OK for lab and acceptance scenarios, but on production systems, I’d leave it enabled.

I got this from:  http://social.technet.microsoft.com/Forums/en-US/sharepointadmin/thread/a8ec1c91-c0d2-42ca-a222-35e7f0cecf26

Update:

Users experience authentication issues when they access a Web page in IIS 6.0 or query Microsoft SQL Server 2000 after you install Windows Server 2003 Service Pack 1 ( http://support.microsoft.com/kb/887993 )

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